Information about Foundry Layer 4-7 Switches

Fellow NANOGers,

Are there in this list someone which worked with Foundry Layer 4-7
switches? Are they up with manufacturer's promises? Please shed some
light on this subject, testimonials, experience. I am specially
interested in Application Load Balancing solutions.

Foundry's web site is at

http://www.foundrynet.com/solutions/sol-app-switch/sol-app-avail/

TIA,

Marlon Borba, CISSP.